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n in (-oo:+oo)
(3/4)*n-(2/9) = 25/9 // - 25/9
(3/4)*n-(2/9)-(25/9) = 0
(3/4)*n-2/9-25/9 = 0
3/4*n-3 = 0 // + 3
3/4*n = 3 // : 3/4
n = 3/3/4
n = 4
n = 4
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